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servo: Merge #10824 - Communicate a backtrace to the constellation when panicking (from asajeffrey:communicate-backtrace-on-panic); r=Manishearth 

Send a representation of the backtrace from a pipeline thread to the constellation in the case of panic. This is the next step in communicating the backtrace to the browser chrome (#10334).

Source-Repo: https://github.com/servo/servo
Source-Revision: f773dc182badef4a4afac240d0d6fcbf57b76452
This commit is contained in:
Alan Jeffrey 2016-04-26 13:17:33 -07:00
Родитель 2f28c7365d
Коммит edc1efc288
10 изменённых файлов: 197 добавлений и 70 удалений
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34
servo/components/compositing/constellation.rs
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@ -54,7 +54,6 @@ use std::borrow::ToOwned;
use std::collections::HashMap; use std::collections::HashMap;
use std::env; use std::env;
use std::io::Error as IOError; use std::io::Error as IOError;
use std::io::{self, Write};
use std::marker::PhantomData; use std::marker::PhantomData;
use std::mem::replace; use std::mem::replace;
use std::process; use std::process;
@ -183,6 +182,9 @@ pub struct Constellation<LTF, STF> {
// Webrender interface, if enabled. // Webrender interface, if enabled.
webrender_api_sender: Option<webrender_traits::RenderApiSender>, webrender_api_sender: Option<webrender_traits::RenderApiSender>,
/// Have we seen any panics? Hopefully always false!
handled_panic: bool,
/// The random number generator and probability for closing pipelines. /// The random number generator and probability for closing pipelines.
/// This is for testing the hardening of the constellation. /// This is for testing the hardening of the constellation.
random_pipeline_closure: Option<(StdRng, f32)>, random_pipeline_closure: Option<(StdRng, f32)>,
@ -369,6 +371,7 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
child_processes: Vec::new(), child_processes: Vec::new(),
document_states: HashMap::new(), document_states: HashMap::new(),
webrender_api_sender: state.webrender_api_sender, webrender_api_sender: state.webrender_api_sender,
handled_panic: false,
random_pipeline_closure: opts::get().random_pipeline_closure_probability.map(|prob| { random_pipeline_closure: opts::get().random_pipeline_closure_probability.map(|prob| {
let seed = opts::get().random_pipeline_closure_seed.unwrap_or_else(random); let seed = opts::get().random_pipeline_closure_seed.unwrap_or_else(random);
let rng = StdRng::from_seed(&[seed]); let rng = StdRng::from_seed(&[seed]);
@ -810,9 +813,9 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
// Panic messages // Panic messages
Request::Panic((pipeline_id, panic_reason)) => { Request::Panic((pipeline_id, panic_reason, backtrace)) => {
debug!("handling panic message ({:?})", pipeline_id); debug!("handling panic message ({:?})", pipeline_id);
self.handle_panic(pipeline_id, panic_reason); self.handle_panic(pipeline_id, panic_reason, backtrace);
} }
} }
true true
@ -842,28 +845,28 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
fn handle_send_error(&mut self, pipeline_id: PipelineId, err: IOError) { fn handle_send_error(&mut self, pipeline_id: PipelineId, err: IOError) {
// Treat send error the same as receiving a panic message // Treat send error the same as receiving a panic message
debug!("Pipeline {:?} send error ({}).", pipeline_id, err); debug!("Pipeline {:?} send error ({}).", pipeline_id, err);
self.handle_panic(Some(pipeline_id), format!("Send failed ({})", err)); self.handle_panic(Some(pipeline_id), format!("Send failed ({})", err), String::from("<none>"));
}
fn handle_panic(&mut self, pipeline_id: Option<PipelineId>, reason: String, backtrace: String) {
error!("Panic: {}", reason);
if !self.handled_panic || opts::get().full_backtraces {
// For the first panic, we print the full backtrace
error!("Backtrace:\n{}", backtrace);
} else {
error!("Backtrace skipped (run with -Z full-backtraces to see every backtrace).");
} }
fn handle_panic(&mut self, pipeline_id: Option<PipelineId>, reason: String) {
if opts::get().hard_fail { if opts::get().hard_fail {
// It's quite difficult to make Servo exit cleanly if some threads have failed. // It's quite difficult to make Servo exit cleanly if some threads have failed.
// Hard fail exists for test runners so we crash and that's good enough. // Hard fail exists for test runners so we crash and that's good enough.
let mut stderr = io::stderr(); error!("Pipeline failed in hard-fail mode. Crashing!");
stderr.write_all("Pipeline failed in hard-fail mode. Crashing!\n".as_bytes())
.expect("Failed to write to stderr!");
process::exit(1); process::exit(1);
} }
debug!("Panic handler for pipeline {:?}: {}.", pipeline_id, reason); debug!("Panic handler for pipeline {:?}: {}.", pipeline_id, reason);
if let Some(pipeline_id) = pipeline_id { if let Some(pipeline_id) = pipeline_id {
self.replace_pipeline_with_about_failure(pipeline_id);
}
}
fn replace_pipeline_with_about_failure(&mut self, pipeline_id: PipelineId) {
let parent_info = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.parent_info); let parent_info = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.parent_info);
let window_size = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.size); let window_size = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.size);
@ -893,6 +896,9 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
} }
self.handled_panic = true;
}
fn handle_init_load(&mut self, url: Url) { fn handle_init_load(&mut self, url: Url) {
let window_size = self.window_size.visible_viewport; let window_size = self.window_size.visible_viewport;
let root_pipeline_id = PipelineId::new(); let root_pipeline_id = PipelineId::new();

2
servo/components/msg/constellation_msg.rs
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@ -35,7 +35,7 @@ impl<T: Serialize + Deserialize> Clone for ConstellationChan<T> {
} }
} }
pub type PanicMsg = (Option<PipelineId>, String); pub type PanicMsg = (Option<PipelineId>, String, String);
#[derive(Copy, Clone, Deserialize, Serialize, HeapSizeOf)] #[derive(Copy, Clone, Deserialize, Serialize, HeapSizeOf)]
pub struct WindowSizeData { pub struct WindowSizeData {

31
servo/components/servo/Cargo.lock сгенерированный
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@ -116,6 +116,27 @@ dependencies = [
"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)", "x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "backtrace"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "backtrace-sys"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "bincode" name = "bincode"
version = "0.5.3" version = "0.5.3"
@ -380,6 +401,15 @@ dependencies = [
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)", "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "dbghelp-sys"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "debug_unreachable" name = "debug_unreachable"
version = "0.0.6" version = "0.0.6"
@ -2253,6 +2283,7 @@ name = "util"
version = "0.0.1" version = "0.0.1"
dependencies = [ dependencies = [
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)", "app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)", "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)", "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",

1
servo/components/util/Cargo.toml
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@ -29,6 +29,7 @@ git = "https://github.com/servo/ipc-channel"
[dependencies] [dependencies]
app_units = {version = "0.2.3", features = ["plugins"]} app_units = {version = "0.2.3", features = ["plugins"]}
backtrace = "0.2.1"
bitflags = "0.3" bitflags = "0.3"
deque = "0.3.1" deque = "0.3.1"
euclid = {version = "0.6.4", features = ["unstable", "plugins"]} euclid = {version = "0.6.4", features = ["unstable", "plugins"]}

1
servo/components/util/lib.rs
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@ -18,6 +18,7 @@
#![deny(unsafe_code)] #![deny(unsafe_code)]
extern crate app_units; extern crate app_units;
extern crate backtrace;
#[allow(unused_extern_crates)] #[allow(unused_extern_crates)]
#[macro_use] #[macro_use]
extern crate bitflags; extern crate bitflags;

32
servo/components/util/panicking.rs
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@ -2,11 +2,9 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use opts;
use std::any::Any; use std::any::Any;
use std::boxed::FnBox; use std::boxed::FnBox;
use std::cell::RefCell; use std::cell::RefCell;
use std::io::{Write, stderr};
use std::panic::{PanicInfo, take_hook, set_hook}; use std::panic::{PanicInfo, take_hook, set_hook};
use std::sync::{Once, ONCE_INIT}; use std::sync::{Once, ONCE_INIT};
use std::thread; use std::thread;
@ -31,9 +29,6 @@ pub fn set_thread_local_hook(local: Box<FnBox(&Any)>) {
/// Should be called in main() after arguments have been parsed /// Should be called in main() after arguments have been parsed
pub fn initiate_panic_hook() { pub fn initiate_panic_hook() {
// store it locally, we can't trust that opts::get() will work whilst panicking
let full_backtraces = opts::get().full_backtraces;
// Set the panic handler only once. It is global. // Set the panic handler only once. It is global.
HOOK_SET.call_once(|| { HOOK_SET.call_once(|| {
// The original backtrace-printing hook. We still want to call this // The original backtrace-printing hook. We still want to call this
@ -44,34 +39,15 @@ pub fn initiate_panic_hook() {
let name = thread::current().name().unwrap_or("<unknown thread>").to_string(); let name = thread::current().name().unwrap_or("<unknown thread>").to_string();
// Notify error handlers stored in LOCAL_INFO if any // Notify error handlers stored in LOCAL_INFO if any
LOCAL_INFO.with(|i| { LOCAL_INFO.with(|i| {
if let Some(info) = i.borrow_mut().take() { if let Some(local_info) = i.borrow_mut().take() {
debug!("Thread `{}` failed, notifying error handlers", name); debug!("Thread `{}` failed, notifying error handlers", name);
(info.fail).call_box((payload, )); (local_info.fail).call_box((payload, ));
} else {
hook(&info);
} }
}); });
// Skip cascading SendError/RecvError backtraces if allowed
if !full_backtraces {
if let Some(s) = payload.downcast_ref::<String>() {
if s.contains("SendError") {
let err = stderr();
let _ = write!(err.lock(), "Thread \"{}\" panicked with an unwrap of \
`SendError` (backtrace skipped)\n", name);
return;
} else if s.contains("RecvError") {
let err = stderr();
let _ = write!(err.lock(), "Thread \"{}\" panicked with an unwrap of \
`RecvError` (backtrace skipped)\n", name);
return;
}
}
}
// Call the old hook to get the backtrace
hook(&info);
}; };
set_hook(Box::new(new_hook)); set_hook(Box::new(new_hook));
}); });
} }

18
servo/components/util/thread.rs
Просмотреть файл

@ -2,6 +2,7 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use backtrace::Backtrace;
use ipc_channel::ipc::IpcSender; use ipc_channel::ipc::IpcSender;
use panicking; use panicking;
use serde::Serialize; use serde::Serialize;
@ -20,7 +21,7 @@ pub fn spawn_named_with_send_on_panic<F, Id>(name: String,
state: thread_state::ThreadState, state: thread_state::ThreadState,
f: F, f: F,
id: Id, id: Id,
panic_chan: IpcSender<(Id, String)>) panic_chan: IpcSender<(Id, String, String)>)
where F: FnOnce() + Send + 'static, where F: FnOnce() + Send + 'static,
Id: Copy + Send + Serialize + 'static, Id: Copy + Send + Serialize + 'static,
{ {
@ -31,7 +32,20 @@ pub fn spawn_named_with_send_on_panic<F, Id>(name: String,
let reason = payload.downcast_ref::<String>().map(|s| String::from(&**s)) let reason = payload.downcast_ref::<String>().map(|s| String::from(&**s))
.or(payload.downcast_ref::<&'static str>().map(|s| String::from(*s))) .or(payload.downcast_ref::<&'static str>().map(|s| String::from(*s)))
.unwrap_or_else(|| String::from("<unknown reason>")); .unwrap_or_else(|| String::from("<unknown reason>"));
let _ = panic_chan.send((id, reason)); // FIXME(ajeffrey): Really we should send the backtrace itself,
// not just a string representation. Unfortunately we can't, because
// Servo won't compile backtrace with the serialize-serde feature:
//
// .../quasi_macros-0.9.0/src/lib.rs:19:29: 19:32 error: mismatched types:
// expected `&mut syntex::Registry`,
// found `&mut rustc_plugin::Registry<'_>`
// (expected struct `syntex::Registry`,
// found struct `rustc_plugin::Registry`) [E0308]
// .../quasi_macros-0.9.0/src/lib.rs:19 quasi_codegen::register(reg);
//
// so for the moment we just send a debug string.
let backtrace = format!("{:?}", Backtrace::new());
let _ = panic_chan.send((id, reason, backtrace));
})); }));
f() f()
}).expect("Thread spawn failed"); }).expect("Thread spawn failed");

31
servo/ports/cef/Cargo.lock сгенерированный
Просмотреть файл

@ -101,6 +101,27 @@ dependencies = [
"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)", "x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "backtrace"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "backtrace-sys"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "bincode" name = "bincode"
version = "0.5.3" version = "0.5.3"
@ -350,6 +371,15 @@ dependencies = [
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)", "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "dbghelp-sys"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "debug_unreachable" name = "debug_unreachable"
version = "0.0.6" version = "0.0.6"
@ -2130,6 +2160,7 @@ name = "util"
version = "0.0.1" version = "0.0.1"
dependencies = [ dependencies = [
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)", "app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)", "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)", "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",

36
servo/ports/geckolib/Cargo.lock сгенерированный
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@ -39,6 +39,27 @@ name = "aster"
version = "0.15.0" version = "0.15.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "backtrace"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "backtrace-sys"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "bincode" name = "bincode"
version = "0.5.3" version = "0.5.3"
@ -65,6 +86,11 @@ name = "byteorder"
version = "0.5.1" version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "cfg-if"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]] [[package]]
name = "cssparser" name = "cssparser"
version = "0.5.5" version = "0.5.5"
@ -78,6 +104,15 @@ dependencies = [
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)", "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "dbghelp-sys"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "debug_unreachable" name = "debug_unreachable"
version = "0.0.6" version = "0.0.6"
@ -545,6 +580,7 @@ name = "util"
version = "0.0.1" version = "0.0.1"
dependencies = [ dependencies = [
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)", "app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)", "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)", "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",

31
servo/ports/gonk/Cargo.lock сгенерированный
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@ -94,6 +94,27 @@ dependencies = [
"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)", "x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "backtrace"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "backtrace-sys"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "bincode" name = "bincode"
version = "0.5.3" version = "0.5.3"
@ -343,6 +364,15 @@ dependencies = [
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)", "serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "dbghelp-sys"
version = "0.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "debug_unreachable" name = "debug_unreachable"
version = "0.0.6" version = "0.0.6"
@ -2111,6 +2141,7 @@ name = "util"
version = "0.0.1" version = "0.0.1"
dependencies = [ dependencies = [
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)", "app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)", "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)", "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",